1 /* $OpenBSD: strtofflags.c,v 1.7 2015/08/20 21:49:29 deraadt Exp $ */
2
3 /*-
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/types.h>
33 #include <sys/stat.h>
34
35 #include <stddef.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 #include <string.h>
39
40 static const struct {
41 char *name;
42 u_int32_t flag;
43 int invert;
44 } mapping[] = {
45 /* shorter names per flag first, all prefixed by "no" */
46 { "nosappnd", SF_APPEND, 0 },
47 { "nosappend", SF_APPEND, 0 },
48 { "noarch", SF_ARCHIVED, 0 },
49 { "noarchived", SF_ARCHIVED, 0 },
50 { "noschg", SF_IMMUTABLE, 0 },
51 { "noschange", SF_IMMUTABLE, 0 },
52 { "nosimmutable", SF_IMMUTABLE, 0 },
53 #ifdef __FreeBSD__
54 { "nosunlnk", SF_NOUNLINK, 0 },
55 { "nosunlink", SF_NOUNLINK, 0 },
56 #endif
57 { "nouappnd", UF_APPEND, 0 },
58 { "nouappend", UF_APPEND, 0 },
59 { "nouchg", UF_IMMUTABLE, 0 },
60 { "nouchange", UF_IMMUTABLE, 0 },
61 { "nouimmutable", UF_IMMUTABLE, 0 },
62 { "nodump", UF_NODUMP, 1 },
63 { "noopaque", UF_OPAQUE, 0 },
64 #ifdef __FreeBSD__
65 { "nouunlnk", UF_NOUNLINK, 0 },
66 { "nouunlink", UF_NOUNLINK, 0 }
67 #endif
68 };
69 #define longestflaglen 12
70 #define nmappings (sizeof(mapping) / sizeof(mapping[0]))
71
72 /*
73 * fflagstostr --
74 * Convert file flags to a comma-separated string. If no flags
75 * are set, return the empty string.
76 */
77 char *
fflagstostr(u_int32_t flags)78 fflagstostr(u_int32_t flags)
79 {
80 char *string;
81 char *sp, *dp;
82 u_int32_t setflags;
83 int i;
84
85 if ((string = calloc(nmappings, longestflaglen + 1)) == NULL)
86 return (NULL);
87
88 setflags = flags;
89 dp = string;
90 for (i = 0; i < nmappings; i++) {
91 if (setflags & mapping[i].flag) {
92 if (dp > string)
93 *dp++ = ',';
94 for (sp = mapping[i].invert ? mapping[i].name :
95 mapping[i].name + 2; *sp; *dp++ = *sp++) ;
96 setflags &= ~mapping[i].flag;
97 }
98 }
99 *dp = '\0';
100 return (string);
101 }
102
103 /*
104 * strtofflags --
105 * Take string of arguments and return file flags. Return 0 on
106 * success, 1 on failure. On failure, stringp is set to point
107 * to the offending token.
108 */
109 int
strtofflags(char ** stringp,u_int32_t * setp,u_int32_t * clrp)110 strtofflags(char **stringp, u_int32_t *setp, u_int32_t *clrp)
111 {
112 char *string, *p;
113 int i;
114
115 if (setp)
116 *setp = 0;
117 if (clrp)
118 *clrp = 0;
119 string = *stringp;
120 while ((p = strsep(&string, "\t ,")) != NULL) {
121 *stringp = p;
122 if (*p == '\0')
123 continue;
124 for (i = 0; i < nmappings; i++) {
125 if (strcmp(p, mapping[i].name + 2) == 0) {
126 if (mapping[i].invert) {
127 if (clrp)
128 *clrp |= mapping[i].flag;
129 } else {
130 if (setp)
131 *setp |= mapping[i].flag;
132 }
133 break;
134 } else if (strcmp(p, mapping[i].name) == 0) {
135 if (mapping[i].invert) {
136 if (setp)
137 *setp |= mapping[i].flag;
138 } else {
139 if (clrp)
140 *clrp |= mapping[i].flag;
141 }
142 break;
143 }
144 }
145 if (i == nmappings)
146 return 1;
147 }
148 return 0;
149 }
150